math of chemistry

addition and subtraction rules:

• Use the smallest amount of decimal places.
• exponents must be the same.

EX.1 4.2 x 10*4 g
+ 3 x 10*3 g
convert
42 x 10*3 g
+3 x 10*3 g
simplify
42,000 g
+3,000 g
45,000 g or 45 x 10*3 g
Multiplacation rules:

• use the smallest amount of sigfnificant figures.
• the M factors are multiplied while the exponents are added


EX. 2 5.23 x 10*6
x 7.1 x 10*-2
37,133 x 10*4
convert and round
3.71 x 10*5
finished.
Division rules

• use the smallest amount of significant figures.
• the M factors are divided while the exponents are subtracted

EX.3 5.44 x 10*7
8.1 x 10*4
divide
0.671... x 10*3
convert
6.71 x 10*2